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Properti Nilai
Judul Hydrological Regimes and Zooplankton Ecology at Tempe Floodplains, Indonesia: Preliminary Study Before the Operation of the Downstream Barrage
Penulis Toruan R.L.,F. Setiawan
Jenis Terbitan JURNAL
Nama Terbitan Trends in Asian Water Environmental Science and Technology
Volume/No/Halaman   0/0/117-125
Kota Penerbit
Abstrak Floodplain is one of a very productive ecosystems (Ning et al. 2013) and harbourshigh biodiversity of micro-invertebrate (Shiel et al. 1998). Flood and drought cyclesinduce high biodiversity, and thus productivity, in the floodplain systems whereconnectivity between terrestrial and aquatic component plays an important role(Sch€oll et al. 2012; Armitage et al. 2003). Floodplain ecosystem features a networkof riverine, and ditches habitats (Armitage et al. 2003), where flood events form alarge inundated area by which the terrestrial and aquatic ecosystems are connected.During drought phase, habitats in riverine-floodplain systems are fragmented andisolated from the main river channel forming distinct habitats with distinctiveabiotic and biotic characteristics (Thomaz et al. 2007). As opposed to dry condition,floods will reconnect the fragmented habitats, allowing the connectivity betweenriverine and floodplain systems; and reduce spatial variability within patchy habitatswhich are formed during low water period. A number of studies suggest thatincreasing water level during floods event results in increasing similarity betweenhabitats as the connectivity established (Thomaz et al. 2007; Tockner et al. 2000). Itis clear that hydrological regime is the key driving force of ecological function andbiodiversity in floodplain systems. There have been little study conducted aboutzooplankton from the floodplain of tropical regions, especially, Indonesia, one ofthe world’s biodiversity “hotspots”. This preliminary study has, therefore,summarised the diverse assemblages of zooplankton of Lake Tempe as a responseto changing water level during dry and flood seasons. Planktonic organisms,including zooplankton, are the key elements in the aquatic environment (Palmerand Yan 2013). The responses of zooplankton to changing environment due tofluctuated water level are fundamental to our understanding of the dynamic ofplanktonic organisms in floodplain habitats, mainly where they are moderately orheavily regulated.Lake Tempe is a riverine floodplain lake undergoing significant changes onwater level that affected the adjacent water course. Hydrological regimes of LakeTempe floodplain provide a chance to study the zooplankton dynamic in the lake.The area of wetland was highly influenced by fluctuating water level resulting inperiodical inundation and drying cycles. Tempe system surface area ranges from280 to 430 km2 with a maximum depth of 9 m during extreme high water levelwhere only about 10 km2 remain inundated during low water period with amaximum depth of 1.5 m. In 2012, barrage at the downstream point was constructedin order to regulate water level of the lakes and was planned to operate in late 2013.The barrage will be closed during dry period to maintain water level at 5 m abovesea level (asl) or 3 m water depth. Floodplain ecosystem is the most productiveecosystem where drying and flooding cycles play an important factor in ecosystemrichness. Zooplankton responds differently to hydrological variable depending onthe environmental factors and the biology of zooplankton (Crome and Carpenter1988). Our study aims to look at the hydrological characteristic of Tempe floodplainand its association with zooplankton community. The study was conductedduring low water (LW) period in 2012 and high water (HW) period in 2013 to lookat the characteristics of hydrological parameters and its association with zooplanktoncommunity specifically before the operation of the downstream barrage

 

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